A NEW POLE SLIPPING PROTECTION ALGORITHM FOR DISPERSED STORAGE AND GENERATION USING THE EQUAL-AREA CRITERION

The probability of pole slipping of Dispersed Storage and Generation(D SG) synchronous machines is being viewed with concern, since this can damage the machine as well as promote power system instability. This i s particularly the case for small and medium sized machines because th eir low inertias and high resistances make them inherently more unstab le. Research has therefore been directed into new techniques for detec ting pole slipping and the formulation of protection algorithms which can be included into an integrated microcomputer based protection sche me for these generators. This paper describes a method for detecting p ole slipping using power measurements taken at the generator's termina ls. This technique has been shown to correctly detect pole slipping us ing both computer simulation and a laboratory model power system. The algorithm remains stable for recoverable swing conditions and power sy stem faults.